Morning journal and courier., 1887-07-07

i
| settled course of life, began to paw away the
| snow and uncovered cropping of mineral,
Mr.. Kellogg wiped his lips, took up his pick,
| and the rich discovery of the Bunker Hill
| was made and his homestake secured. Like
| a thoughtful, kind-hearted man, he deter
| mined his faithful burro should share his
| good luck, and so he sent the animal by -ex-
| press all the way to Forest Grove, there to
revel in clover the remainder of his days.
The little animal, as it stood in Wells, Fargo
| & Co.'s yard yesterday, attracted much at
| tention. He had gorged himself OF oats and
| stood in the shade, a picture of content,
carelessly kicking a fly off his rump with
| one and another from his fetlock with
| the other. The hair was all worn off his
back and he looked rough and shagged, but
| he has earned his rest.
Zinc Etch1ng-New Process.
From Paper and Press1
In the art of etching figures or designs in
| metallic plates it is the common practice to
transfer them upon the metal from photo
graphs, or to draw them thereon with an ink
capable of resisting the action of the acid
employed in the etching process, which eats
away the surrounding metal leaving the de-
sign in high relief In following this meth
| cd, however, the edges of the figures become
almost invariably rounded, thus not produ-
| cling the desired effect in the prints produced.
| It is to obviate these difficulties that the
present process has been invented, which
claims to secure sharp edges or contours in
plates either of zinc or other materials. The
following is the complete description: A
zinc plate having a smooth polished surface
is taken, and upon it is drawn the required
design with an ink composed of asphaltum,
turpentine and oil enough to keep the COM
position in a liquid state) and little lamp-
black to darken it. Or if the object to be
reproduced be an engraving, either stone,
plate, wood or any other material, it is trans
ferred by the usual mode; that is by taking
an impression from the engraving on trans
fer paper" and thence to the zinc plate.
The transfer ink used is compound or Or
dinary photographic printing ink and asphal-
! tum in the proportion of about one-third of
the latter to two-thirds of ink. The draw
! ing or transfer having been completed, and
before the ink has become dry it is covered
with coat of powdered resin or copal, the
back of the plate being also coated with as
phaltum to render it acid proof. The plate
is now ready for the bath, which consists in
muriatic acid of about 12 specific gravity
Cor other suitable acids either in their pure
or diluted state, such as nitric acid, &c.),
where it is allowed to remain about five sec-
onds. It is then taken out, washed, dried,
and when dry heated only enough to melt
the powdered resin or copal, so as to form a
crust which will protect the edges of the
drawing or transfer, which have been formed
by the first exposure of the plate to the etch-
ing agent. The plate is next returned to the
bath of muriatie acid, again allowed to re-
main about five seconds and washed and
dried once more. Those portions which are
high enough to print are then covered with
asphaltum, and another coat of powdered
resin OF copal is added, after which it is
o1o%a ~ Io41 all 10 ~,
until sufficient depth is obtained on the ex-
posed parts. These operations of covering
the plate and returning to the acid may
have to be repeated three or four times,
according to the nature of the work. The
plates used of course restricted to such
metals as are affected similar to zinc. The
process will doubtless prove considerable
advance upon present methods.
NOT THE FIRST STEAM WAGON.
One of NIaine's Inventive Sons Thinks
He Can Drive his Cart a Mile a Min
ute.
From the Lewiston Journal
'tThe rich can ride in chaises," and they
can ride in a steam wagon, too, if they will
come TO Lewiston and essay what the tenn
ing brain of remarkable Lewiston inventor
has attained. In the first place it is wag-
on. 1t is built on the principle of grocery
wagon. Some of the extra heavy grocery
teams On the street might have served for
the basis of the eontrivance, except the in
ventor, Edwin F. Field, desired that it be
extra strong, and SO he had the wheels and
axles and bars &C., built trifie heavier
than on the ordinary grocery wagon. Its
shape is the same Its wheels are the same
in size and shape. Its wagon body is exactly
the same as that of the ordinary delivery
wagon, with iron bands. The boiler, which
is upright, sits OH the rear axle. Power is
applied by cogged wheels to the rear axle,
to which the hind wheels are rigidly affixed,
so that the movement of the machinery pro-
pels the wagon. The front wheels are indie
pendent of machinery, and are simply steer
ing gear. The engine is a double cylinder
condensing engine, controlled by the link
motion, exactly as in the locomotive.
It can be reversed or stopped from the
drivers seat. Water is carried in a small
tank under the wagon-bed The engine ex-
hausts into the boiler-the exhaust being
easily controlled from the drivers seat. Tho
boiler is a fve-horse power, tested to four
hundred pounds pressure, and capable of
CARRYING three hundred pounds without the
slightest difficulty. The engines develop
four-horse power with one hundred pounds
pressure or twelve-horse power with three
hundred pounds.
With hard coal, the boiler will make 10
smoke or steam. The design of the builders
is to conceal everything, and they expect,
when finished, that the contrivance will not
frighten horses any more than bicycle or
street sprinkler Every portion of the ma
chinery is made with the view of strength.
various inventions on the boiler make 1t
specially valuable, while every part of the
engine has been designated and built ex-
nressly for the purpose, and is full of od-
dities and inventions. The axles are steel
and the wheels iron-hubbed. The hind
wheels are thirteen feet in diameter. The
water tank holds half barrel, and would
suffice for run of twenty-five miles.
"Have you.ever run itg" was asked of Mr..
Field eyes" was the reply. 'sWe have
worked the engines and the wheels, but
haven't tried it on the ground yet. 1t was
great success The hind wheels went in q
Perfect buzz. We estimated it at eight hun
dred revolutions minute; and as the car
riage will advance about five feet at revo-
luton, we reckon that. making due allow
ance. the wagon would have been going
considerably faster than two-minute clip.
I don't practically see any limit to the at
tainment of speed except the courage of the
driver"
inc A description does it no sort of credit,
and the public should see to appreciate
Il There is no sort of doubt but that the
machine will go. and that it can be steered
| ana controlled From the wayside brook the
water tank can be filed, and from the coal
| locker the fires of the boiler. Mr.. Field
| thinks that the machine can go mile min
ute. He will have the hind wheels drilled
and corrugated for teeth, provided there is
not Fiction enough; but he says that he has
| no fear about the friction.